The problem that email login mailbox

Hello, I am a novice, I have two mail server. The mail was sent to the mailbox server randomly. But through the domain login could not see all of the mail. How to see all of the mail Settings? Who can help me? thanks

It's a multi-server installation and new install.I have two mailbox and two message store.For example: I sent 10 e-mails to one account ,6 e-mails were put in the one message store,the rest of the deposit into another.When a user logs E-mail, cannot show 10 e-mails... What method can display 10 e-mails?